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US10899024B2 - Safety for assist opening knife - Google Patents

Safety for assist opening knife Download PDF

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Publication number
US10899024B2
US10899024B2 US15/844,383 US201715844383A US10899024B2 US 10899024 B2 US10899024 B2 US 10899024B2 US 201715844383 A US201715844383 A US 201715844383A US 10899024 B2 US10899024 B2 US 10899024B2
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US
United States
Prior art keywords
safety
safety switch
implement
folding tool
handle half
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US15/844,383
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English (en)
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US20190184584A1 (en
Inventor
Wes Duey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Benchmade Knife Co Inc
Original Assignee
Benchmade Knife Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Benchmade Knife Co Inc filed Critical Benchmade Knife Co Inc
Priority to US15/844,383 priority Critical patent/US10899024B2/en
Assigned to BENCHMADE KNIFE CO., INC. reassignment BENCHMADE KNIFE CO., INC. CORRECTIVE ASSIGNMENT TO CORRECT THE SERIAL AND ATTORNEY DOCKET NUMBERS PREVIOUSLY RECORDED AT REEL: 044412 FRAME: 0139. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT . Assignors: DUEY, WES
Priority to TW107143911A priority patent/TWI693991B/zh
Priority to EP18212561.7A priority patent/EP3498439B1/en
Priority to CN201811536335.XA priority patent/CN109968405B/zh
Publication of US20190184584A1 publication Critical patent/US20190184584A1/en
Application granted granted Critical
Publication of US10899024B2 publication Critical patent/US10899024B2/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B1/00—Hand knives with adjustable blade; Pocket knives
    • B26B1/02—Hand knives with adjustable blade; Pocket knives with pivoted blade
    • B26B1/04—Hand knives with adjustable blade; Pocket knives with pivoted blade lockable in adjusted position
    • B26B1/048—Hand knives with adjustable blade; Pocket knives with pivoted blade lockable in adjusted position with a locking member being slidable or movable along the handle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F1/00—Combination or multi-purpose hand tools
    • B25F1/02—Combination or multi-purpose hand tools with interchangeable or adjustable tool elements
    • B25F1/04—Combination or multi-purpose hand tools with interchangeable or adjustable tool elements wherein the elements are brought into working positions by a pivoting or sliding movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B1/00—Hand knives with adjustable blade; Pocket knives
    • B26B1/02—Hand knives with adjustable blade; Pocket knives with pivoted blade
    • B26B1/04—Hand knives with adjustable blade; Pocket knives with pivoted blade lockable in adjusted position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B1/00—Hand knives with adjustable blade; Pocket knives
    • B26B1/10—Handles

Definitions

  • the present disclosure relates to folding tools, and more particularly, to a folding tool having a safety lock that prevents the unwanted deployment of a blade that opens with a spring activated assist.
  • Folding knives are invaluable tools that are used in many aspects of everyday life. There are many types and styles of folding knives.
  • a “manual” folding knife is a traditional type of tool in which the blade is manually movable by the user between a closed or stowed position in which the sharp edge of the blade is held safely within the handle, and an open position in which the blade is extended in an operable position.
  • Certain folding knives include mechanisms that assist in the deployment of the blade. These assist opening knives allow a user to easily deploy the blade with one hand.
  • Many folding knives also include mechanisms that lock the blade in the open position, primarily as a safety feature.
  • FIG. 1 is a perspective and exploded view of a folding knife having a safety lock mechanism that keeps the blade from being inadvertently deployed, in accordance with various embodiments.
  • FIG. 2A is a side elevation view of the knife shown in FIG. 1 in a partially assembled condition with the blade in the locked, open, extended position and the safety switch in the on, locked position, in accordance with various embodiments.
  • FIG. 2B is a side elevation view of the knife shown in FIG. 1 in a partially assembled condition with the blade in the locked, open, extended position and the safety switch in the on, locked position, in accordance with various embodiments.
  • FIG. 3 is a side elevation view of a liner, in accordance with various embodiments.
  • FIG. 4A is a side elevation view of a safety switch, in accordance with various embodiments.
  • FIG. 4B is a perspective view of a safety switch, in accordance with various embodiments.
  • FIG. 5A is a cross sectional view of the knife shown in FIG. 2 in a partially assembled condition with the blade in a closed position with the safety switch in the on, locked position, in accordance with various embodiments.
  • FIG. 5B is a cross sectional view of the knife shown in FIG. 2 in a partially assembled condition with the blade in a partial open position as the blade is being transitioned from the open, extended position to the closed position with the safety switch in the on, locked position, in accordance with various embodiments.
  • FIG. 5C is a cross sectional view of the knife shown in FIG. 2 in a partially assembled condition with the blade in closed position with the safety switch in the off, unlocked position, in accordance with various embodiments.
  • Coupled may mean that two or more elements are in direct physical contact. However, “coupled” may also mean that two or more elements are not in direct contact with each other, but yet still cooperate or interact with each other.
  • a phrase in the form “A/B” or in the form “A and/or B” means (A), (B), or (A and B).
  • a phrase in the form “at least one of A, B, and C” means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).
  • a phrase in the form “(A)B” means (B) or (AB) that is, A is an optional element.
  • the description may use the terms “embodiment” or “embodiments,” which may each refer to one or more of the same or different embodiments.
  • the terms “comprising,” “including,” “having,” and the like, as used with respect to embodiments are synonymous, and are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.).
  • Opening assist mechanisms have been incorporated into folding knives for some time (see, for example, U.S. Pat. Nos. 7,748,122 and 8,171,645).
  • the blade is retained in the closed position without the need for a trigger to deploy the blade.
  • the opening assist function is provided by a spring that operates to deploy the blade.
  • the spring mechanism reaches a threshold point, after which the spring drives the blade to the open or deployed position.
  • the present disclosure relates to a folding tool having a safety lock mechanism that prevents or inhibits the deployment of an implement, such as a knife blade, when the safety feature is engaged, that is in the “safety on” position.
  • the folding tool is a folding knife and the implement is a knife blade.
  • the disclosed tool includes a locking mechanism (for example, an AXIS® lock as described in U.S. Pat. No. RE 41,259, which is hereby incorporated herein by reference in its entirety) that securely locks the blade in the open extended position.
  • the disclosed tool includes an open assist mechanism, for example as disclosed in U.S. Pat. Nos. 7,748,122 and 8,171,645, which are hereby incorporated herein by reference in their entirety.
  • the folding tool includes a safety lock mechanism that effectively prevents the blade from being accidently deployed when the safety lock is in the closed, safety on, position, and the blade is in the closed position.
  • a safety lock mechanism that effectively prevents the blade from being accidently deployed when the safety lock is in the closed, safety on, position, and the blade is in the closed position.
  • One of the unique features of the disclosed safety lock mechanism is that it is configured so that the blade can be actively closed while the safety lock is in either the on, locked, position or the off, unlocked, position.
  • the safety lock mechanism can be engaged when the blade is open and does not interfere with the action of closing the blade.
  • a folding tool such as a folding knife
  • the folding tool includes a handle having a first handle half and a second handle half held in a spaced apart relationship, for example to form an implement groove for accepting the implement in the closed position.
  • the implement is pivotally connected between the first handle half and the second handle half by a pivot pin and the implement is movable between an open position and closed position by rotation about this shaft.
  • the implement such as a knife blade, includes a tang and a working portion, for example the sharpened portion of a knife.
  • the folding tool further includes a safety lock mechanism that prevents the unwanted deployment of the implement.
  • the safety lock mechanism includes a safety switch positioned between the first handle half and the second handle half.
  • the safety switch has central portion with a front end, a rear end, a top side, a bottom side, and is movable from a first safety on position to a second safety off position, for example by sliding back and forth between the two handle halves.
  • the safety switch includes two wing portions extending laterally from the central portion. In embodiments, the two wing portions are configured to slide within two opposing wing grooves that are on the two interior and facing sides of the first handle half and the second handle half, respectfully.
  • the individual handle halves are made from a liner and a sidewall, with the liner in the interior and the side wall on the exterior of the handle.
  • each handle half may be made as a single unitary element.
  • the safety switch is configured to interact with a portion of the implement tang to prevent the implement from opening when the safety switch is in the safety on position.
  • this tang includes a scalloped pocket or indentation that, when the implement is in the closed position, is in proximity to the front end of the safety switch such that the front end of the safety switch resides at least partially within this scalloped pocket or indentation and thereby prevents rotation of the implement from the closed position towards the open position.
  • the tang may include a small protrusion that extends from the tang and that, when the implement is in the closed position, is in proximity to the front end of the safety switch such that the front end of the safety switch prevents rotation of the implement from the closed position toward the open position.
  • the front end of the safety switch includes a front surface and a bumper.
  • the tang portion includes the flipper, which is extended from the remainder of the tang and provides a lever for activation of the assist mechanism.
  • the flipper includes a scalloped pocket and/or a protruding portion separated from the sharpened part of the blade by a choil.
  • the bumper sits in the scalloped pocket and rotation of the blade from the closed position to the open position is prevented by the protruding portion running or bumping against the front surface of the safety switch. This interaction effectively prevents the unwanted deployment of the blade.
  • the scalloped pocket and/or the protruding portion provide a stop to accommodate a bumper and front surface of the safety switch.
  • the safety lock mechanism thus ensures that a knife will not accidently open. With respect to a knife in the safety on position the front end of the safety blocks the blades rotation keeping it closed. However, when the safety is moved to the safety off position the blade can be opened. Typically the opening of the blade would be accomplished by a separate motion from moving the safety switch to the off position.
  • the safety lock mechanism includes a force producing member that retains the safety switch within the wing grooves and prevents unwanted movement of the safety switch, for example by applying pressure that makes unwanted or unassisted movement of the safety switch difficult.
  • the force producing member comprises a spring, such as a compression spring or a leaf/cantilever spring.
  • the spring is a leaf/cantilever spring and is made as a unitary body with the liner.
  • each of the two wings include an upper guide surface and a lower guide surface that allow the wings to slide back and forth and position the wings within the wing grooves.
  • each of the two wings includes a front ramped surface and a rear ramped surface wherein the front ramped surface and the rear ramped surface are configured to allow the safety switch to rotate about the wings in response to an upward pressure on the front end of the safety switch.
  • the front ramped surface and the rear ramped surface are substantially parallel.
  • the safety switch can be indexed or retained in the safety on and/or safety off position, such that the switch must be manually moved from one to the other and will not accidently slide.
  • this retention is made possible by the inclusion of indexing cavities in the top of the wings and corresponding indexing teeth on or within the wing grooves.
  • the safety switch is positioned in the locked or unlocked position by the indexing teeth interacting with the indexing cavity.
  • some downward pressure must be applied to overcome the force of the force producing member, which applies constant upward pressure on the safety switch, before the wings can be moved over the indexing teeth.
  • the central portion of the safety switch includes a central channel on the bottom side separating two side rails, wherein the central channel is configured to accept the working end of the blade when in the closed position.
  • the two wings are coupled to the two side rails.
  • the safety switch includes a thumb actuation surface that extends outward from the handle of the folding tool.
  • the tool includes an opening assist mechanism.
  • the opening assist mechanism includes a cylindrical sleeve disposed about the pivot pin and a torsion spring disposed within the cylindrical sleeve and about the pivot pin.
  • the folding tool includes a lock bar that is movable between a first position and a second position, wherein the first position locks the implement in an open position, and moving the lock bar to the second position releases the implement from being locked in the open position.
  • the lock bar is biased to the first position by one or more springs.
  • the tang includes a first ramped surface that interacts with the lock bar in the open position.
  • FIGS. 1 through 5C a folding knife 10 having a closed blade safety lock as disclosed is illustrated in FIGS. 1 through 5C .
  • the blade 15 can be locked in the open, extended position, for example using an AXIS® lock mechanism.
  • the knife 10 further includes a safety lock mechanism that retains and locks the blade 15 in a closed position and prevents unwanted deployment of the blade 15 via an opening assist mechanism 30 .
  • the folding knife 10 according to an embodiment of the present disclosure is shown in perspective exploded view in FIG. 1 .
  • the folding knife 10 includes an elongate handle 12 that includes a first handle half 13 having a first sidewall 14 and an associated first liner 20 and a second handle half 17 having a second sidewall 18 with its associated second liner 22 .
  • the handle further includes spacers 11 disposed within handle 12 and between the first handle half 13 and the second handle half 17 .
  • a blade 15 is pivotally attached to the handle 12 between the first handle half 13 and the second handle half 17 at one end, referred to herein as the “forward” end of the handle 12 .
  • the blade 15 is pivotally movable about a blade pivot pin 25 between the open and closed positions along a blade plane.
  • the X-Y plane is the plane parallel to the plane of the handle 12 and blade 15 .
  • the blade 15 travels in the X-Y plane as it is rotated between the closed and open positions.
  • the Z plane is the plane transverse to the X-Y—the blade pivot pin 25 extends longitudinally in the Z-plane.
  • the knife 10 includes a locking mechanism.
  • the locking mechanism of the knife 10 includes a lock bar 28 that extends transverse to the plane of the handle 12 and which has its opposite ends extending in slots 29 in sidewalls 14 and 18 , which align operationally with paired slots 31 in liners 20 and 22 .
  • the lock bar 28 is spring loaded with two U or horseshoe-shaped lock springs 60 , one such spring associated with each of liners 20 and 22 and positioned between the sidewalls 14 and 18 and their associated, adjacent liners 20 and 22 .
  • each lock spring is fixed to the associated liner and the second end of the lock spring is attached to the lock bar 28 so that the lock bar 30 is always driven in the “forward” direction by the springs—that is, in the direction from the handle 12 toward the tip of the blade 15 when the blade is in the open position.
  • the lock bar 28 and the springs that act on the lock bar 28 lock the blade 15 in the open position, for example as shown in U.S. Pat. No. RE 41,259.
  • the lock bar 28 is driven forward and interacts with detent 32 of blade 15 to lock the blade open.
  • the knife 10 further includes a safety lock mechanism, which includes portions of the blade tang 16 , the liners 20 and 22 , and a safety switch 50 .
  • FIG. 2A is a side elevation view of a partially constructed knife 10 , showing the components of the safety lock mechanism, including the blade 15 , the liner 22 , and the safety switch 50 (the liner 20 would be behind the liner 22 and may include all of the features discussed, see FIG. 2B , which shows the components with liner 22 removed).
  • the liner 22 includes the force producing member 61 , in this case a leaf type spring, which drives the safety switch 50 upward.
  • the safety switch 50 includes wings 51 (only one is visible) disposed on either side of the safety switch 50 , which slides within a wing groove 62 of the liner 22 .
  • the central portion 56 rides between the two liners in the assembled knife.
  • the wing 51 rides in the wing groove 62 present in the two liners.
  • the wing groove 62 includes a front tooth 63 and a rear tooth 64 , which act as place holders for the wing 51 in the locked and unlocked positions, respectively.
  • the wing 51 includes a lower sliding surface 53 and upper sliding surface 54 , that allow the safety switch 50 to move forward and backward within the wing groove 62 .
  • the wing 51 includes an indexing cavity 52 that is configured to receive one of the teeth 63 and 64 , depending on whether the safety switch 50 is in the locked or unlocked position.
  • the force producing member 61 is configured to provide force on the bottom sliding surface 53 of the closed blade lock safety switch 50 causing the upper sliding surface 54 and the indexing cavity 52 to engage with the front tooth 63 and the rear tooth 64 .
  • the liner 22 is shown in FIG. 3 . As can be seen from FIG.
  • the gap or width of the wing groove 62 is less than when the wing is inserted, demonstrating the tension applied by the force producing member 61 when the wing is inserted.
  • the wing groove 62 includes a front tooth 63 and a rear tooth 64 , which act as place holders for the wing 51 in the locked and unlocked positions, respectively.
  • FIGS. 4A and 4B show the details of the safety switch 50 .
  • the safety switch 50 includes wings 51 having an indexing cavity 52 and disposed on either side of the central portion 56 .
  • the central portion 56 further includes a front end 80 and a rear end 81 .
  • the safety switch 50 includes a thumb actuation surface 57 , that, in the assembled knife, protrudes from the knife handle so that a finger or thumb of a user can access the safety switch 50 , for example, to slide the safety switch 50 back and forth between the locked to unlocked positions.
  • the wing 51 includes several surfaces that are designed to allow the safety switch 50 to slide back and forth as well as rock when the knife blade is moved from the open position to the closed position while the safety switch 50 is in the closed, safety on position.
  • the lower sliding surface 53 and the upper sliding surface 54 allow the safety switch 50 to move forward and backward within the wing groove.
  • a forward ramped surface 58 and a rear ramped surface 59 are configured to allow the safety switch 50 to pivot within the wing groove and allow the front end 80 of the safety switch 50 to move upward, for example in response to rotation of the blade from the open position to the closed position when the safety switch is in the safety on position. This movement will be discussed in more detail below with respect to FIGS. 5A-5C .
  • the front end 80 includes a front scalloped pocket 82 , a bumper 83 , and a front surface 84 . These aspects of the safety switch 50 will be discussed further with respect to FIGS. 5A-5C .
  • the bottom of the central portion 57 includes a central channel 85 that separates two side rails 86 .
  • the central channel 85 and the rails 86 are configured so that the blade of the knife can slot into the central portion 57 when the blade is in the closed position.
  • the two side rails 86 further provide a location for the attachment of the wing 51 .
  • FIGS. 5A-5B the operation of the safety lock mechanism will be discussed.
  • the mechanism is jointly composed of features of the blade 15 , the liner 20 , and the safety switch 50 .
  • FIG. 5A is a cross sectional view of the knife shown in FIG. 2 in a partially assembled condition with the blade 15 in a closed position with the safety switch 50 in the safety on, locked position.
  • the tang portion 16 of the blade 15 includes several features that work in concert with safety switch 50 to provide a safety lock mechanism that helps to prevent the unwanted assisted deployment of the blade 15 .
  • the liner 20 provides the force to hold the safety switch 50 in position as well as a channel for its movement.
  • the tang portion 16 includes the flipper 90 , which is extended from the remainder of the tang and provides a lever for activation of the assist mechanism.
  • the flipper 90 includes a scalloped pocket 92 and a protruding portion 93 separated from the sharpened part of the blade 15 by a choil 91 .
  • the scalloped pocket 92 and the protruding portion 93 provide a stop to accommodate the bumper 83 and the front surface 84 of the safety switch 50 .
  • the bumper 83 sits in the scalloped pocket 92 and rotation of the blade 15 from the closed position to the open position is prevented by the protruding portion 93 running or bumping against the front surface 84 of the safety switch 50 .
  • FIG. 5B is a cross sectional view of the knife shown in FIG. 2 in a partially assembled condition with the blade 15 in a partial open position as the blade 15 is being transitioned from the open, extended position to the closed position with the safety switch 50 in the safety on, locked position.
  • the flipper 90 pushes the bumper 82 upward causing the safety switch 50 to rotate about the wing 51 .
  • FIG. 5C is a cross sectional view of the knife shown in FIG. 2 in a partially assembled condition with the blade 15 in closed position with the safety switch 50 in the off, unlocked position. In this position, it is evident that the bumper 84 is no longer in a position to inhibit the deployment of the blade 15 .
  • a cylindrical sleeve 44 extends through a bore 40 formed in liner 20 , and an aligned bore 42 formed in the liner 22 .
  • the cylindrical sleeve 44 also extends through aligned pivot bore 46 through tang portion 16 of blade 15 .
  • the cylindrical sleeve 44 is fitted snugly and fixedly through the pivot bore 46 in tang 16 of blade 15 so that the cylindrical sleeve 44 defines a rotational pivot axis for the blade extending transversely with respect to the plane of the blade 15 and the handle halves 13 and 17 .
  • sleeve 44 is axially aligned in the Z-direction—transverse to the X-Y plane.
  • torsion spring 45 Disposed within the cylindrical sleeve 44 is torsion spring 45 .
  • sleeve cap 37 fits within a groove of the cylindrical sleeve 44 .
  • One leg of torsion spring 45 fits within a groove in the cylindrical sleeve 44 while another leg of the torsion spring 45 fits within a recess 47 in the tang portion 16 of the blade 15 .

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US15/844,383 2017-12-15 2017-12-15 Safety for assist opening knife Active 2038-04-30 US10899024B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US15/844,383 US10899024B2 (en) 2017-12-15 2017-12-15 Safety for assist opening knife
TW107143911A TWI693991B (zh) 2017-12-15 2018-12-06 用於輔助開啟刀具之安全裝置
EP18212561.7A EP3498439B1 (en) 2017-12-15 2018-12-14 Safety for assist opening knife
CN201811536335.XA CN109968405B (zh) 2017-12-15 2018-12-14 用于辅助打开式刀具的安全装置

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Application Number Priority Date Filing Date Title
US15/844,383 US10899024B2 (en) 2017-12-15 2017-12-15 Safety for assist opening knife

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US20190184584A1 US20190184584A1 (en) 2019-06-20
US10899024B2 true US10899024B2 (en) 2021-01-26

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US (1) US10899024B2 (zh)
EP (1) EP3498439B1 (zh)
CN (1) CN109968405B (zh)
TW (1) TWI693991B (zh)

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US12496736B2 (en) 2021-10-22 2025-12-16 Fiskars Brands, Inc. Knife with safety lock

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US11135730B1 (en) * 2018-01-24 2021-10-05 Rexford Knives, LLC Switch lock apparatus
US11904484B2 (en) * 2020-08-24 2024-02-20 Benchmade Knife Co., Inc. Knife with specialized balance and blade length
US20250108526A1 (en) * 2023-10-03 2025-04-03 Kai U.S.A., Ltd. Assisted opening and closing knife with lock
US20250303592A1 (en) * 2024-04-01 2025-10-02 Andrew Demko Auto opening folding knife blade engagement lock

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TW201927499A (zh) 2019-07-16
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